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| Question | Answer |
| How would we measure fringes? | Stick sheet of graph paper to the wall and mark the fringes that are shown Then remove it and take measurements using vernier calliper |
| How could we reduce the uncertainty of fringe spacing measurements? | Measure several fringes and divide by the amount of gaps between them (amount of gaps = number of fringes - 1) |
| How could we get the most accurate value of the distance between the slit and the screen? | Use a tape measure Ensure the distance is ≥ 2m |
| To improve accuracy, the room should be.... | Dark |
| To further improve accuracy, we could.... | Repeat measurements (which reduces the effect of random errors) |
| What laser safety steps should be followed? | Avoid shining laser at / near person Laser safety goggles Avoid reflections Warning sign or light to warn unaware |
| What would the fringes look like if white light was used? | -Central fringe is white -Fringes are wider than for monochromatic -Other fringes are a spectrum of colours, violet on inside, red on outside of each -These will overlap with each-other as they are much wider than a monochromatic fringe |
| Define monochromatic | A single wavelength or frequency |
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